For potatoes to turn out crispy in the oven, briefly parboil the slices, roughen their surfaces by shaking to loosen excess starch, then roast with enough oil at high heat. Many people asking whether potatoes can get crispy in the oven skip the preparation step before roasting. This prep, together with the right temperature, is the quickest way to get potatoes crisp outside and soft inside. Crispness comes from surface starch rapidly losing moisture and hardening in high heat. If potatoes stay wet, steam in the oven keeps their surfaces soft and prevents a crunchy texture. Dry the slices thoroughly and space them out on the tray. Higher-starch varieties generally turn out crispier. High-heat cooking oils or a blend of butter and olive oil help the surfaces brown evenly.
Steps for Crispy Oven-Roasted Potatoes
• Cut potatoes into evenly sized slices or cubes.
• Parboil in boiling water for 5–6 minutes, then drain.
• Gently shake the drained potatoes in the pot to roughen their surfaces.
• Toss thoroughly with 2 tablespoons of cooking oil or olive oil.
• Preheat the oven to 220°C / 430°F.
• Arrange in a single layer on the tray with space between the pieces.
• Bake for 30–35 minutes, turning them 1 time midway through.
Common Mistakes
Crowding the tray traps steam. Parboiling too long makes potatoes fall apart; too briefly leaves the centers firm. Too little oil prevents browning. Frequently opening the oven lowers its temperature and extends cooking time. Skipping parchment can make potatoes stick. Tossing the potatoes with oil before their steam escapes traps moisture and delays browning.
More Tips
Add finely chopped garlic or dried thyme to the cooking oil for extra flavor and browning. Dust the parboiled slices with a thin layer of cornstarch for a firmer crust. Roast on the oven’s middle rack for even heat. With evenly cut slices, brief parboiling, enough oil, and spaced-out roasting at high heat, potatoes can turn out crisp outside and soft inside. Careful preparation makes the biggest difference.